Bought it over a year ago for my Lang 48. I found very little difference in basicly everything! Did it improve burn times? Marginally. Cleaner smoke? Negative. It actually created dirtier smoke when it tried to lower the temps by slowing down the fan or shutting it down completely. That is the case when you use it in auto mode where it's supposed to maintain temps for you. In manual mode , it works ok, blowing a constant wind on the fire that keeps the fire clean burning. It did not create longer burn times so the wood consumption for me was about the same as it is without it. The only difference for me that I can recall was that I was able to close the firebox door sooner than usual. There's a video on YouTube that shows a guy using it and having great success with it. He was cooking on a Lang 36. I don't know... maybe I'll give it another try.